JOHANNES EISELE/AFP/Getty Images(TEHRAN, Iran) -- Google's new social networking site, Google+, launched just about three weeks ago and it has already attracted over 10 million members around the world. But Iran can only seem to imagine a negative about Google+, making it harder for Iranians to join.

Iran has blocked access to the new social networking site, calling it a new U.S. government spy tool on the Web. Facebook and Twitter faced similar allegations before they were blocked, too.

The decision appears to be another attempt to prevent young opponents of the regime from having online political discussions, planning protests and communicating with sympathizers abroad. But many Iranians will use proxy websites to get around the restriction, and some have already joined Google+.